Features: Insert and play, no need to set up, just insert in the 3.5mm interfaces to use. Eliminate various types of current noise, improve current noise generated by the playback device, and enjoy original sound. Wireless link plays smooth mobile music, voice calls, navigation plays safe driving. A speaker without wireless function can also play wirelessly when connection to 3.5mm interfaces. The common ground isolation module can effectively eliminate sound of current generated by the common ground, allowing you to hear purer and quieter music. Noise reduction designing, build-in noise filter; small size and portable, easy to install and use. Specifications: Material: ABS Color: Black Size: approx. 66x32x16mm/2.6x1.26x0.63inch Model: M29 Interfaces: 3.5mm Version: BLE5.4 Wireless distance: about 10m Main function: Wireless reception & common ground isolation Package Includes: 1Pc Stereo Isolator note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.